Hasp hook



Och 28 1924.

l. FRITSCH HASP HGOK Filed may e, 1922 Patented ct. 28, 1924.

narran stares isms@ IGNAZ rnrrscn, or WENNA, AUs'rRI'A.

HAS? HOOK.

Application led May 6, 1922. Serial No. 558,983.`

To all who/mJ t may] concern.'

Be it known that l, IGNAZ FRITSCH, citi- Zen of the Austrian Republic, residing at Vienna, Austria, have invented cert-ain new and useful Improvements in and Relating to l-lasp Hooks, of which the following isi a specification. My invention relates to a fastening de `vice which ycan bek used for various purposes such as fastening lids on boxes, cases and the like. The object of my invention to provide a simple and cheap device of this character which consists of a mininum number of parts and which, 1f locked, is

' safe guarded against becoming accidentally unlocked. VJ ith these ,and other objects in View I provide a safety fastening device, comprising a movable member, adapted to .be swim@ around a ivot and to resilientl n n n u lv yield in a direct-ion substantially perpendicnlar to the plane in which it swings,'a fixed catch, extending into the path of said mov'- able member, and locking means on said members, adapted to become operative by f reason of the movable member resiliently regaining its normal untensioned condition.

One mode of carrying out the present invention is shown, by way of example, in the accompanying drawing, in which- Fig. l is a front view,

Fig. 2 a side View, and

Fig. 3 a plan view of the device with the hook in the'locked position, Y Y r Fig. 4t illustrates in plan viewzthe khook in the act of engagement with its locking bolt. f

The hook l, which is preferablystamped out of a piece of sheet metal, is rotatably secured between washers 6 and 7 mounted on a pin 2 and provided with agrip et at the rear of its nose 3. Vertically to its plane of rotation the'shaft of the ,hook is somewhat bent, and in engaging the headed locking bolt or catch 9 it will yield towards the wall 5 of the receptacle tobe locked, and thereby be placed undertonsion. The nose 3 of the hook is partly deflected in such a manner, that its forward end is somewhat inclined and points towards the Wall 5. The nose 8 of the hook is provided with a recess 8, whose curvature vcorresponds to the circumference of Athe headed screw-bolt 9 which engages the hook in the locked position. "As shown the screwbolt 9 is furnished .with a reduced part l() and the nose 3 of the hook is of such a shapefthat its inner edge will Vjust pass over Vthe said ,reducedl part l0, when the hook is broughtinto engagement with the,V

locking bolt l0. As shown in the drawing,` the inner face of the hook is curved'v eccentrically.y The distance between the free end or nose 3 of the hook and the centre of rotation represented by the pivot pin y2 is the smallest, the part 8 of the inner face of the hook being farther distant from this pin. The free end or nose 3 extends atan angle tothe plane of rotation so, as to form a cam'fac'e. bolt 9form1ngothe `catch member which 1ntersectsvthe plane of rotation. of the hook isfarther distant from thefcentre of rotation of the hook than the free end or ynose 8, while being less Vdistant than the partV 8 ofthe inner face ofthe hook.

The device acts in the following manner:A 'A ,Y i In .the act of moving the hook from the position indicated 4in dotted lines (Fig. Al.)

into the, position illustrated in fnll lines,

the pointed endof Vthe hook-nose Savilly freely move past the reducedlportion l0 of the bolt 9. Owing totheV wedg'eelire action of the nose 3, the sideface of the'y latter will come into contact with the plane side face of. the part9 of the headed screw-` in contact-with the lower face of the head..

ll. Thereby the hook is securely locked to the bolt, and may be unlocked only, by forcthe nose towards the wall 5; Y

The locking device according to they present invention possesses the great advantage, that Vit is absolutely rigid in the di-V rection of its rotation, Vas well as in its locked position and that itA can yieldv only in thetransvcrse direction V(parallelto its axis of rotation).

kThe invention is not limited to the con. struction as illustrated.V Forinstance the That part of the/headed loo resiliency of the hook may be attained in \fariousmanners, and further the action of the spring-force may be inverse so that for unlocking the hook instead of a pressure, a pull has to be exerted on the hook-nose; Of course the tension of the hook may also be obtained by attaching a spring to the hook. The action of the inclined nose may, for instance, -be attained by means of a wedge-"like formation of the nose, or by securing inclined or Wedge-like faces to the nose. "Further the device' may be formed tom suit the desiredfrequirements, for instance' Whether the hook engages With a bolt of' with "speye, and the part causing theV locking'may be arranged either on the hook or ni.'itsfcounterpart v 'Ielaim: i 1 Asa'fety fastening device, comprising a. movableY`- member, adapted to be swung 'alui'd a pivot and to resiliently yield in a ctfion'substan'tially perpendicular to the dii' plane in which lit' swings, a fixed catch, extending 'into the path of said movable inembe'i","ari`d locking" means on'said members, ad "pted to become operative by reason/of tlie"'-novable 'member resili'ently regaining its normal untens'ioned condition.

2. A safety fastening device, comprising Avthe plane in which it swings, a fixed catch,

extending into the path `of` said movable member, and'loc'kmg means on said members,"adapted to become operative by reason of the movable member resiliently-regaining its normal untensioned condition.

3. AL safety vfastening device, comprising; a 'movable` member, adapted to be'swung ai'ourida pivot, and to ybecome resiliently deformed in a direction vperpendicular to Y* the planeA in Whicli'it swings, a fixed catch,

extending into 4the path ofA saidA movable niemberflocling means on said members z, ap d tobecome operative "by reason of the`v rnb'vable f member resiliently regaining its normal untensioned condition, and a cam on one of said members, adapted to resillently deform the latter for the subsequent locking action.

d. A safety fastening device, comprising a movable hook-end member, adapted to be swung around a pivot and tofbe resiliently deformed in a direction substantially per pendicular to the plane in which it swings, a fixed catch, extending into the path of said hook-end member, and locking'means en said members, adapted to'become operative! by reason of the hook-end member resiliently regainingits untensioned condition. f

5. A safety fastening device comprising a movable hook-end member, adapted to .be swung around a Vpivot and to be resilient-ly deformed yin a direction substantially perpendicular to the plane in which it swings, a fixed catch, extending` into theV path of aid hook-endmember, and locking means on said members, adapted to become oper by reason of the hook-end member resiliently regaining its untensioned condition, and a cam onl one of said-meinbers, adapted to resi iently deform the latter for the subsequent loclrin` action.

6. 'safety fastening device, comprising; a movable hook-end member, adapted to be swung' around a pivot and to be resili-` ently deformed in a direction substantially perpendicular' to they plane in which it siringa a fixed catch extending into the path of said hook-end member-,and lock ing` means on said members, adapted to Vbecome operative by reason of the hook-end member resilient-ly regaining its unteiisioiied condition, and cam on said hook-end meinber, adapted to resilientlyv deform the latter for the subsequent locking action.

In testimony whereof l affix my signa ture in `presence of two Witnesses.v Y

DR. IGNAZ FRITSCH. Witnesses: y V FRiTZ Anoia UMnAN'rioHnN'rsoHY, HArRiM FRAMTEL. i 

